The late Interior Cabinet Secretary Joseph Nkaissery died of a heart attack, preliminary investigations have revealed.

A postmortem conducted on Monday to determine the cause of his death indicated that he suffered a condition known as myocardial infarction – literally, “death of heart muscle.”

The post-mortem was conducted by government pathologist Johansen Odour in the presence of two family pathologists, two family doctors, the family lawyer and a family member.

Dr Byakika Bissie, the family pathologist told journalists that Nkaissery “suffered an acute fatal heart attack as a result of a compromised blood vessel to the heart.”

“He had a sudden onset fatal heart attack. This arose because one of the major blood vessels supplying the wall of his heart was severely compromised and could only allow a very small volume of blood to pass through it, resulting in the heart area that is supplied to undergo death. Because of this, the electronic activity of the heart was compromised and death ensued,” the doctor explained.

The doctors ruled out the possibility of foul play in the CS’s death though further tests are going to be carried out.

The autopsy was conducted at Lee Funeral Home. It started at around 10.30am and was scheduled to end at 4 pm.

Top detectives among them Nairobi DCI chief Ireri Kamwende, Kilimani DCI boss Philis Kanina and Karen DCI boss Joane Njoki together with detectives from homicide unit were also present at the mortuary.